I believe VintageInlines has the remaining stock of these from Mike. Matt doesn't have them up on the site yet though. I can ping him about it to see if he can get them up on the website for ordering.
Are you running a header or a stock exhaust? I ask because there is a significant difference in the port size of a stock gasket (or even the remflex). The CI gaskets size the holes to mate up with a header design as opposed to the larger siamese opening. See here:
http://www.classicinlines.com/proddetai ... OR-200-HEG
Edit: I'm not saying 1 is better than the other. Mike seemed to think so, but I'm no expert.